Title: Audio signal time-duration converter

Abstract: An audio signal time-duration converter comprises a random access memory. The compression and expansion of input signals is effected by designating an address in the random access memory and assigning the designated address to a write mode or read mode. The address designation is effected either from an output from a write address counter which serves to count write clock pulses or an output from a read address counter which serves to count read clock pulses. However, in the event of overlap of the read and write clock pulses, the outputs are controlled exclusively by the write clock pulses. In addition, the time duration of the read and write clock pulses is made to be different so that both operations are ensured in a sequential manner in case of such overlap.

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Inventors: Tanizoe, Toshio (Hitachi, JA)
Kubota, Takashi (Katsuta, JA)

Application Number: 509070
Filing Date: 1974-09-25
Publication_date: 1976-04-06
Assignee: Hitachi, Ltd. (JA)
Primary Class(es): 704/503
Other Classes:
US Patent Ref:

3104284	Sep, 1963	French et al.	179/15.
3621150	Nov, 1971	Pappas	360/100.
3752912	Aug, 1973	Oshawa et al.	179/15.
3803363	Apr, 1974	Lee	179/15.
B262287	Jan, 1975	Yoshino et al.	85/22.

Other Refs:
Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Kemeny, E. S.
Attorney: Craig & Antonelli